Method and apparatus for processing video signal

Abstract

A video signal processing method according to the present invention is characterised by constructing a palette map for a current block that is encoded in a palette mode; inducing a palette index for each sample of the current block in a pre-determined scan order; and restoring the respective samples of the current bock based on the palette map and the palette index.

Description

TECHNICAL FIELD[0001]The present invention relates to a method and a device for processing a video signal.BACKGROUND ART[0002]Demands for high-resolution, high-quality images such as High Definition (HD) images and Ultra High Definition (UHD) images have recently increased in various fields of applications. As video data has a higher resolution and higher quality, the video data is larger in amount than traditional video data. Therefore, if video data is transmitted on an existing medium such as a wired / wireless wideband circuit or stored in an existing storage medium, transmission cost and storage cost increase. To avert these problems encountered with higher-resolution, higher-quality video data, high-efficiency video compression techniques may be used.[0003]There are a variety of video compression techniques including inter-picture prediction in which pixel values included in a current picture are predicted from a picture previous to or following the current picture, intra-pictur...

AI Technical Summary

Benefits of technology

[0051]According to the present invention, it is possible to improve the efficiency of prediction or restoration of a block to be encoded / decoded based on a palette mode.

[0052]According to the present invention, the pallet entry encoding / decoding efficiency can be improved by deriving the palette map of the block to be encoded / decoded from the palette map of the previous block.

[0053]According to the present invention, a palette index of a block to be encoded / decoded can be efficiently derived based on an index mode or a copy mode.

[0054]According to the present invention, the compression efficiency can be improved by encoding the palette index using the binary vector based on the run encoding.

[0055]According to the present invention, the sample values of the block to be encoded / decoded can be restored based on the escape mode, so that the samples out of the palette entry range can be efficiently encoded / decoded.

Problems solved by technology

Therefore, if video data is transmitted on an existing medium such as a wired / wireless wideband circuit or stored in an existing storage medium, transmission cost and storage cost increase.

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